| 摘要 |
A method for controlling a supply of refrigerant to an evaporator (2) of a vapour compression system (1), such as a refrigeration system, an air condition system or a heat pump. The opening degree of the expansion valve (3) is controlled on the basis of an air temperature, Tair, of air flowing across the evaporator (2), and in order to reach a reference air temperature, Tair, ref. The opening degree is set to the calculated opening degree, overlaid with a perturbation signal. A temperature signal, S2, representing a temperature of refrigerant leaving the evaporator (2) is monitored and analysed. In the case that the analysis reveals that a dry zone of the evaporator (2) is approaching a minimum length, the opening degree of the expansion valve (3) is decreased. This provides a safety mechanism which ensures that liquid refrigerant is prevented from passing through the evaporator (2). |
| 主权项 |
1. A method for controlling a supply of refrigerant to an evaporator of a vapour compression system, the vapour compression system comprising at least one evaporator, at least one compressor, at least one condenser and at least one expansion valve arranged in a refrigerant circuit, the method comprising the steps of:
obtaining a temperature, Tair, of air flowing across the evaporator, controlling an opening degree of the expansion valve, on the basis of the obtained temperature, Tair, and in order to reach a reference air temperature, Tair, ref, of the air flowing across the evaporator, providing a perturbation signal, and setting the opening degree of the expansion valve to the controlled opening degree, overlaid with the perturbation signal, monitoring a temperature signal, S2, representing a temperature of refrigerant leaving the evaporator, analysing the temperature signal, S2, and decreasing the opening degree of the expansion valve in the case that said analysis reveals that a dry zone of the evaporator is approaching a minimum length. |
